JP3014785B2 - Candle type filter having a filter jacket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention provides a filter and support element and a cap that is hermetically and removably secured to the upper end of the filter by a cap and that is hermetically and removably secured to a base of the filter by a fastener. The present invention relates to a candle filter for a filtration device, which comprises a filtration envelope, in particular for the filtration of relatively viscous fluid media.

[0002] Candle type filters of this kind are, for example,
It is known from German Patent No. C2-3326288. Known candle filters consist of an exclusion body surrounded by a support tube. This support tube is supported outside the filter tube. Filter tubes are replaceable. In order to replace the filter tube, the entire candle filter must be unscrewed from the base. To this end, the upper end of the candle-shaped filter is configured as a six-sided screw. After the entire candle filter has been unscrewed, the conical ring threaded on the top of the candle filter must be unscrewed for filter replacement. The filter tube is pressed against the sealing ring by a conical ring, also present at the lower end of the candle filter, the latter being connected to the rejection body. For changing the filter tube, after the conical ring has been unscrewed, the filter tube is moved further on the sealing ring, the new filter tube is raised accordingly and the whole sequence is reversed and fixed.

A disadvantage of these known candle filters with replaceable filter tubes is that they require a time-consuming and complicated procedure for replacing the filter tubes. Moreover,
Due to the construction conditions with a projecting surface for the screw tightening tool, there is a dead space in the head around the candle filter, where the temperature-sensitive substance stays for a relatively long time. These spaces increase the diameter of the individual candle filters and, consequently, the dense filling of each candle filter into a large filter device, as is common in the filtration of industrial polymer melts. Becomes difficult.

Further, German Patent Publication No. B2-25127
No. 81 discloses a reversible filtration device, in which a support is firmly connected to the lid and the sleeve. This connection comprises a hardenable sealing material or a welded connection between the support and the lid or sleeve.

[0005] The disadvantage of these devices is that they can only be replaced as a whole when the candle filter becomes unusable, so that the melt residue cannot be used frequently in the filtration device. This means that backwashing cannot be applied, which results in large filter consumption.

The present invention thus produces as little as possible a stagnation zone of the polymer melt, which can be packed tightly in a relatively large filtration unit and which is filtered by the cured polymer melt residue. In the event that the filter becomes irreversibly unusable, the candlelight filter has a relatively small size and a simple structure that allows the filter to be easily replaced without having to discard the entire candle filter. Intended for filters.

[0007] The new object is achieved by a novel device in which the filtration envelope is tightly coupled with a cap designed for good flow and forms a unit in which the filtration envelope and the filtration cap can be exchanged. Can be.

[0008] The filtration envelope and the filtration cap are preferably made of a metallic material, in particular high-grade steel. The strong connection between the filter cap and the filter mesh preferably consists of welding or soldering. By eliminating the protruding surface for the spanner,
The filtration cap can be finished with almost no stagnation area. In addition, candle filters having this novel feature can be finished to small dimensions, for example, having an overall height of no more than 15 cm or no more than 10 cm,
In this case, the outer diameter of the cap is only slightly larger than the filtration envelope. Thus, the diameter of the new candle filter is kept very small. For example, 5
cm or less, or even 3 cm or less, or even 2 cm or less in diameter. An embodiment of an all-candle filter, which is generally in close proximity to the filter body, can be achieved, whereby a close filling of the individual candle filters into a large filtration device can be achieved. The preferred form of the cap is essentially a cone with an acute or obtuse cone angle. The outer edge of the cap provides a surface as large as possible for fixing the filter envelope by finishing it essentially cylindrical. The inside of the cap is essentially formed as a fit that tightly surrounds the head of the filter.
A hermetic and releasable connection to the filter body is thereby achieved. In addition to the favorable properties of the flow of the cap thus formed, it has the advantage of being simple and inexpensive to manufacture.

The sealing in the lower part of the candle filter is provided by a circular tapered cone. When the tapered cone is pushed up onto the filter body with the filter mesh, the lower part of the filter mesh is squeezed so that it can be sealed and removed between the sealing ring and the taper cone located in the lower part of the filter body. Is done. Thereby, the fixing of the taper cone and the separation of the melt zone and the filtrate zone in the lower part of the filter body can be achieved.

[0010] A particularly preferred embodiment is characterized in that all components, in particular hermetically sealed and removable joints, are finished without threading.

Surprisingly, despite such a thread-free embodiment, a sufficient seal between the melt zone and the filtrate zone can be achieved. An advantage of such an embodiment is that the candle filter thus produced can be disassembled particularly easily and quickly. Components without screw threads can be cleaned simply and easily.
Furthermore, the elimination of a projecting surface for the tool for turning the screw makes it possible to make all components particularly flow-friendly.

Another preferred embodiment of the present invention provides a simple spiral design in which the support elements do not have additional support bars, for example as disclosed in DE-B-2 251 781. A wire coil that loosely surrounds the filter body as a safety mechanism against side slip of the assembled filter body.

[0013] The filter body has an essentially cylindrical base configuration, which is accompanied by an axially communicating drainage chamber for the filtrate. The mounting of the wire coil is preferably effected by means of four or six radially running support arms, which likewise define the lateral limits of the drainage chamber. This embodiment allows both parts to be easily cleaned from the solid filtrate residue after separation of the filter and support,
Alternatively, in a case where the device becomes unusable, only the individual components need to be replaced.

A further preferred embodiment is characterized in that the base of the filter body is provided with a snap-in connection with a connection sleeve without thread and a corresponding hole in the bottom plate.

A particular advantage of this embodiment resides in a simple inset connection between the bottom plate and the candle filter. Surprisingly, a leak-free separation of the melt side and the filtrate side can be achieved with this type of connection. Moreover, the candle filter in this embodiment can be particularly easily replaced.

The following is a description with reference to the drawings.

FIG. 1 shows a vertical section of a candle filter. The interior of the candle filter comprises a filter 1 and a helical wire coil 2 loosely surrounding the filter 1. A filter jacket 3 is present on the filter body 1 and the support element 2 and is welded at the end to the cap 4. The filter cap 4 is limited in its interior by a correspondingly shaped cavity, which surrounds the head of the filter body 1 as a leak-free and removable fit.

Below, below the filter body 1, which is open to the bottom plate or the filtrate chamber, forms an essentially cylindrical, thread-free connecting sleeve 5, which is a sealing ring 11
Is accompanied by It is associated with an annular, conical-shaped sealing device 6, whereby the lower part of the filter envelope 3 is clamped between the sealing ring 11 and the cone 6. The connecting sleeve 5 is finished so that it can be inserted into a corresponding hole 7 in the bottom plate 8.

FIG. 2 shows a horizontal section of a candle filter. The filter 1 has four support arms 9 between which there is a hollow space 10 for draining the filtrate. The filter 1 with the support arm 5 is surrounded by a helical wire coil 2. The outside of the wire coil 2 is in contact with the filtration jacket 3.

For replacement of the candle filter, it is removed from the filter by pressure on the connecting sleeve 5. After removal of the sealing ring 6, pulling the cap 4 separates the filter envelope and the filter cap from the rest of the candle filter. After replacement or cleaning of the parts, the candle filter can be mounted again in the bottom plate 8 by reversing these steps.

The main features and aspects of the present invention are as follows.

1. The filter (1) and the support element (2) and the sealing device (6) and the associated sealing ring (6) which are fixed to the upper end of the filter (1) in a sealing and removable manner by means of a cap (4) A filtration device, especially for the filtration of relatively viscous fluid media, comprising a filtration envelope (3) hermetically and removably secured to the base of the filtration body (1) according to 11). In a candle type filter, the filter jacket (3) is a cap (4).
The candle-shaped filter, characterized in that the filter jacket (3) is tightly coupled to the filter shell (3) and forms a replaceable unit with the filter cap (4).

2. 2. The candle filter according to claim 1, wherein all the components, in particular the sealing and the detachable connection, are constructed without screw threads.

3. 3. A candle filter according to claim 1, wherein the support element (2) is a helical wire coil, which loosely surrounds a correspondingly shaped filter body (1).

4. The first and second features, characterized in that the base of the filter body (1) has a threaded connection sleeve (5) and shows a plug-in connection with a corresponding hole (7) in the bottom plate (8). Or the candle-shaped filter according to item 3.

[Brief description of the drawings]

FIG. 1 shows a vertical section of the novel device of the present invention.

FIG. 2 shows a horizontal section of the novel device according to the invention.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hanes Huon-Halpe German Federal Republic Day 4150 Krefeld 11 Amoverfeld 37A (56) References JP-A-1-254215 (JP, A) 57-86612 (JP, U) Actually open sho 59-97708 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 29/00-29/96 B01D 35/00-35 / 04 B01D 39/00-41/04

Claims (1)

(57) [Claims] 1. A filter (1) and a support element (2) and a sealing device (6) fixed at the upper end of the filter (1) and hermetically and detachably by a cap (4) and It consists of a filter envelope (3), which is hermetically and removably secured to the base of the filter body (1) by an associated sealing ring (11), especially for filtering relatively viscous fluid media. The filter jacket (3) is tightly connected to the cap (4) and the filter jacket (3) together with the filter cap (4) constitutes one replaceable unit The candle-shaped filter, characterized in that it is formed.